package cn.pedant.SweetAlert;

import android.content.Context;
import android.content.res.Resources;
import android.content.res.XmlResourceParser;
import android.util.AttributeSet;
import android.util.Xml;
import android.view.animation.*;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import java.io.IOException;

public class OptAnimationLoader {

	public static Animation loadAnimation(Context context, int id)
			throws Resources.NotFoundException {

		XmlResourceParser parser = null;
		try {
			parser = context.getResources().getAnimation(id);
			return createAnimationFromXml(context, parser);
		} catch (XmlPullParserException ex) {
			Resources.NotFoundException rnf = new Resources.NotFoundException("Can't load animation resource ID #0x" +
					Integer.toHexString(id));
			rnf.initCause(ex);
			throw rnf;
		} catch (IOException ex) {
			Resources.NotFoundException rnf = new Resources.NotFoundException("Can't load animation resource ID #0x" +
					Integer.toHexString(id));
			rnf.initCause(ex);
			throw rnf;
		} finally {
			if (parser != null) parser.close();
		}
	}

	private static Animation createAnimationFromXml(Context c, XmlPullParser parser)
			throws XmlPullParserException, IOException {

		return createAnimationFromXml(c, parser, null, Xml.asAttributeSet(parser));
	}

	private static Animation createAnimationFromXml(Context c, XmlPullParser parser,
			AnimationSet parent, AttributeSet attrs) throws XmlPullParserException, IOException {

		Animation anim = null;

		// Make sure we are on a start tag.
		int type;
		int depth = parser.getDepth();

		while (((type=parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth)
				&& type != XmlPullParser.END_DOCUMENT) {

			if (type != XmlPullParser.START_TAG) {
				continue;
			}

			String  name = parser.getName();

			if (name.equals("set")) {
				anim = new AnimationSet(c, attrs);
				createAnimationFromXml(c, parser, (AnimationSet)anim, attrs);
			} else if (name.equals("alpha")) {
				anim = new AlphaAnimation(c, attrs);
			} else if (name.equals("scale")) {
				anim = new ScaleAnimation(c, attrs);
			}  else if (name.equals("rotate")) {
				anim = new RotateAnimation(c, attrs);
			}  else if (name.equals("translate")) {
				anim = new TranslateAnimation(c, attrs);
			} else {
				try {
					anim = (Animation) Class.forName(name).getConstructor(Context.class, AttributeSet.class).newInstance(c, attrs);
				} catch (Exception te) {
					throw new RuntimeException("Unknown animation name: " + parser.getName() + " error:" + te.getMessage());
				}
			}

			if (parent != null) {
				parent.addAnimation(anim);
			}
		}

		return anim;

	}
}
